射頻濾波器是無線通信系統的關鍵部件之一。本文根據射頻SoC的需求，設計了一種基于Q-增強型射頻有源CMOS LC型濾波器。該濾波器利用負阻抗增強電路品質因數，可有效地解決射頻片上無源LC濾波器的品質因數偏低，插入損耗偏大的問題。該濾波器采用TSMC 0.18um CMOS工藝，當供電電壓為1.8V，中心頻率在2.142GHz時，-3dB帶寬僅為36MHz。仿真結果表明，該濾波器正確有效，適于全集成。
關鍵詞: 片上電感；CMOS工藝；有源濾波器；射頻SoC
A Design Of RF Active Filter Using CMOS Technology
Gao zhi-qiang, Yu ming-yan, Ye yi-zheng
（Microelectronics Center of Harbin Institute of Technology, Harbin 150001, China）
Abstract: RF filter is one of the key components in wireless systems. In this paper, a RF active LC filter based on
Q enhancement has been implemented according to RF SoC （System on a Chip） requirements. The quality
factor of the filter is enhanced by negative resistance, and the filter can solve the problems which the quality
factor is lower and insertion loss is larger in the passive filters. The center frequency is about 2.142GHz in TSMC
0.18um CMOS process when the supply voltage is 1.8V and the -3dB bandwidth is only 36MHz. The simulated results indicate that the filter is both effective and suitable for integration.
Key words: On-chip inductor; CMOS process; Active filter; Radio-Frequency System on a Chip;